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参数资料
| 型号： | PTH08080WAS |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.25 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDMA5 |
| 封装： | ROHS COMPLIANT PACKAGE-5 |
| 文件页数： | 3/17页 |
| 文件大小： | 520K |
| 代理商： | PTH08080WAS |
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Power-Up Characteristics
t-Time=5ms/div
I (0.5 A/div)
I
V (1V/div)
O
V (5V/div)
I
Current Limit Protection
Thermal Shutdown
Output On/Off Inhibit
SLTS235C – FEBRUARY 2005 – REVISED FEBRUARY 2008
When configured per the standard application, the PTH08080 power module produces a regulated output voltage
following the application of a valid input source voltage. During power up, internal soft-start circuitry slows the
rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input
source. Figure 11 shows the power-up waveforms for a PTH08080W, operating from a 12-V input and with the
output voltage adjusted to 1.8 V. The waveforms were measured with a 2-A resistive load.
Figure 11. Power-Up Waveforms
The PTH08080 modules protect against load faults with an output overcurrent trip. Under a load fault condition,
the output current cannot exceed the current limit value. Attempting to draw current that exceeds the current limit
value causes the output voltage to enter into a hiccup mode of operation, whereby the module continues in a
cycle of successive shutdown and power up until the load fault is removed. On removal of the fault, the output
voltage promptly recovers.
Thermal shutdown protects the module internal circuitry against excessively high temperatures. A rise in
temperature may be the result of a drop in airflow, a high ambient temperature, or a higher than normal output
current. If the junction temperature of the internal components exceeds 165
°C, the module shuts down. This
reduces the output voltage to zero. The module starts up automatically, by initiating a soft-start power up when
the sensed temperature decreases 10
°C below the thermal shutdown trip-point.
For applications requiring output voltage on/off control, the PTH08080 power module incorporates an output
on/off Inhibit control (pin 5). The inhibit feature can be used wherever there is a requirement for the output
voltage from the regulator to be turned off.
The power module functions normally when the Inhibit pin is left open-circuit, providing a regulated output
whenever a valid source voltage is connected to VI with respect to GND.
Figure 12 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit control
has its own internal pull-up to 3 volts. An open-collector or open-drain device is recommended to control this
input. Do not place an external pull-up on this pin.
Copyright 2005–2008, Texas Instruments Incorporated
11
Product Folder Link(s) :PTH08080W
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|---|---|
| PTH08080WAST | 功能描述:DC/DC转换器 2.25A Wide Input/ Out Adj Mini Pwr Mdl RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08080WAZ | 功能描述:DC/DC转换器 2.25A Wide Input/ Out Adj Mini Pwr Mdl RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08080WAZT | 功能描述:DC/DC转换器 2.25A Wide Input/ Out Adj Mini Pwr Mdl RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08080WBH | 功能描述:DC/DC转换器 2.25A,4.5-18Vin Wide Adjust Mini Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08082WAS | 制造商:Texas Instruments 功能描述: |
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